Authorities in the nation’s capital say they have identified the human remains found in shallow grave last month as three previously missing women.

Each victim died as a result of homicide, according to a police report released Friday. Their bodies were then buried in a shallow grave and inside a crawlspace at a residence in a southeast D.C. community.

According to WTTG, their causes of death were determined through medical examinations performed on the bodies after construction workers found them near an apartment complex on April 25.

Two victims died from gunshot wounds and the third died as a result of traumatic injuries, investigators say.

As of the latest reports available, the three women had not been identified.

Authorities are working to cross-reference missing persons files in an effort to find any possible matches. In the case of leads, investigators are attempting to test DNA samples of relatives against evidence recovered from the remains.

At this point, authorities have not confirmed the three cases are related and it is unclear how long the bodies were concealed before they were uncovered last month.

Police estimate the remains had been at the scene for more than a year, but said it could have been significantly longer. Additional details were sparse and included the fact that detectives recovered articles of clothing from the scene.

Citing the ongoing investigation into their deaths, police did not expound on the evidence they collected.

Authorities have announced a $25,000 reward in connection with information provided for each of the three homicide cases.